[bugfix] Initial pylint fixes update

- Initial pylint fixes for OpenStack and RHEVM3 python files
- Minor pylint updates to Fedora and RHEL6 & 7 python files
[bugfix] [RHEL/7] Update RHEL-7 service_*_disabled.sh remediation fixes
each of them to actually have / use the form as expected in RHEL-7 with systemd
[RHEL/7] Update form of RHEL-7 service disable / enable check macros
         (from chkconfig to systemctl)
[RHEL/7] Update 'Disable telnet Service' XCCDF rule description
         (default service-disable-macro can't be used in this case)

Version #2: Replace <code> with <tt>. Thanks Shawn.
Version #3: Fix s/xinet.d/xinetd.d/ typo. Thanks Gabe.
Update pylint fixes update

- Don't change python3 references to older versions of python.
- Don't change existing functionality
Merge pull request #239 from iankko/update_rhel7_service_disabled_remediation_fixes

[bugfix] [RHEL/7] Update RHEL-7 service_*_disabled.sh remediation fixes (so they would have the form as expected by systemd)
Merge pull request #240 from iankko/version_3_rhel7_update_service_macros

[bugfix] [RHEL/7] Version #3 - Update form of RHEL-7 service disable / enable check macros
Merge pull request #237 from redhatrises/pylint_fixes_2

[bugfix] Initial pylint fixes update